In a recent article by Serpentor's Lair, it's been revealed that under the Trans Pacific Partnership, brand name clothing companies in the United States have put together a statement which is currently going through the Supreme Court. IF it passes, it would mean that brand name clothing companies have the right to claim copyright on their designs and anyone who makes fakes of these designs would be subject to copyright infringement and met with lawsuits and shut down.
Right now, this does NOT affect fantasy costumes yet and will only affect cosplays which use real brand name clothing in them like Glee, Indiana Jones, Tomb Raider, Uncharted, Lollipop Chainsaw and Suicide Squad, just to name a few examples. What this means in real terms is that cosplay companies which make these infringing articles of clothing will be shut down by the clothing companies and then they'll make these proper items available officially through their stores.
However, the TPP has bigger implications on more than just copyright infringement on clothing. Under rules set by the TPP lawmakers, they would be cracking down on Intellectual Property infringement and in this case, Fan works. Yes, that's right, people in the US can be sued by Japanese Lawyers for simply making fan art or cosplaying as Goku and this can be WITHOUT the main rights holder not having any issues with it. Discussions are still being held by the member states and signatories on the TPP.
Will this be the end of Cosplay and fan works in America and the Pacific? only time will tell to be honest, but I can guarantee, whichever way the TPP goes and whichever way the Supreme court goes with this decision, it WILL change the face of Cosplay and Fan works all across the globe.